Carbohydrates Flashcards
Which two types of sugars are considered “simple”
- monosaccharides
- disaccharides
Which two types of sugars are considered complex sugars?
- oligosaccharides
- polysaccharides
Disaccharides are two monosaccharides joined by a(n) ________ bond
acetyl (glycosidic)
What is the ratio of H:O in CHOs
2:1
Which monosaccharide is nutritionally the most important? Trioses, Pentoses or Hexoses
Hexoses
What is a chiral carbon?
a carbon with four different groups attached to it
What is the difference between D and L sugars
D - last OH is on the right side of the chain
L - last OH is on the left side of the chain
Are D or L sugars more nutritionally important? Why?
D because digestive enzymes are stereospecific for D sugars
Which of the three common disaccharides is/are reducing sugars? (sucrose, lactose and maltose)
- lactose
- maltose
Which of the three common disaccharides is/are non-reducing sugars? (sucrose, lactose and maltose)
sucrose
what is the minimum amount of monosaccharides required to be considered a polysaccharide
6
are hetero or homopolysaccharides more abundant in food?
homopolysaccharides
What are three types of insoluble dietary fibres?
1.Cellulose
2.Hemicellulose
3.Lignin
What are three types of soluble dietary fibres
- Pectin
- Gums
- Mucilages
This dietary fibre has B-1,4 glucose units
Cellulose
This dietary fibre has a mixture of a and b glycosidic linkages
hemicellulose
this dietary fibre has a-1,4-linked-D galacturonic acid backbone
Pectin